GPU Performance

The 4th generation iPad integrates a quad-core PowerVR SGX 554 (MP4). The 554MP4 doubles USSE2 count over the previous generation PowerVR SGX 543MP4 used in the iPad 3, while keeping ROP and TMU counts the same. The result is a pure doubling of peak theoretical shader performance:

Mobile SoC GPU Comparison

PowerVR SGX 543

PowerVR SGX 543MP2

PowerVR SGX 543MP3

PowerVR SGX 543MP4

PowerVR SGX 554

PowerVR SGX 554MP2

PowerVR SGX 554MP4

Used In

-

iPad 2/mini

iPhone 5

iPad 3

-

-

iPad 4

SIMD Name

USSE2

USSE2

USSE2

USSE2

USSE2

USSE2

USSE2

# of SIMDs

4

8

12

16

8

16

32

MADs per SIMD

4

4

4

4

4

4

4

Total MADs

16

32

48

64

32

64

128

GFLOPS @ 300MHz

9.6 GFLOPS

19.2 GFLOPS

28.8 GFLOPS

38.4 GFLOPS

19.2 GFLOPS

38.4 GFLOPS

76.8 GFLOPS

The theoretical numbers validate Apple's "2x faster GPU" claims, but as always we'll turn to Kishonti's GLBenchmark to see how achievable that performance increase is.

We'll start out with the raw theoretical numbers beginning with fill rate:

The peak fill rate test shows a ~16% increase in performance over the previous generation 543MP4. Since there's no increase in number of TMUs we're seeing the results of a higher clocked GPU in the iPad 4's A6X.

There's a pretty hefty improvement in triangle throughput - we're seeing more than a 60% gain compared to the iPad 3.

In both of the final triangle throughput tests the iPad 4 manages a 40 - 45% increase in performance over the iPad 3:

With the synthetics out of the way, we can look at simulated game performance using the Egypt HD and Egypt Classic benchmarks. Remember the on-screen tests are run at native resolution with v-sync enabled, while the offscreen tests are run at 1080p with v-sync disabled for an architectural apples-to-apples comparison.

Despite sub-2x gains in a lot of the synthetic tests, Egypt HD shows us what's possible in a simulated game: the new iPad is roughly twice the speed of the previous gen model when running at the panel's native resolution. How we've seen this implemented in many cases is with titles finally running at native resolution on the iPad 4 vs. some lower, scaled resolution on the iPad 3.

The Egypt Classic test is a much lighter workload, as a result most of these devices hit 60 fps at their native resolution:

Although Egypt HD is a bit overkill for today's games, Classic undershoots by a good amount. The offscreen test however does provide some guidance as to whether or not these devices would be able to hit 30 fps on an appreciably heavier workload:

Really? Not "produce products that will sell twice as well as their predecessors"?

I'm sorry Apple is not entertaining you --- perhaps you did not realize they were not in that business? You might prefer to follow MS whose ups and downs over the next year should provide ample entertainment.Reply

in what way? I would argue that the Nexus 10 is a much better tablet. Stereo audio instead of mono, support for multiple separate users (excellent for families), a Proper aspect ratio... one appropriate for actually consuming media, unlike that iPad. A dedicated HDMI out is a nice touch. There are many, many things I could list. I'm really not even sure what you're talking about in your comment -- color calibration? I'm sure that will be the first thing most consumers check...Reply

There isn't one that is clearly better. The iOS and app store is the biggest thing the iPad has for the average consumer. Proper aspect ratio? Who are you to say what's proper? lol Seriously though, it depends on WHAT you're consuming. 4x3 is ideal for reading, that is books and web browsing. THIS is why Apple sticks with 4x3, and it makes COMPLETE sense. Most of what people do is consume webpages, not videos. Webpages are the focus, and rightly so. I always say, if you want a more serious movie device, watch them on your TV. haha. Color calibration isn't something to check, you notice it right away by looking at it, that it's a more realistic representation of photos, etc. Your arguments are severely flawed, but yes the Nexus 10 is a comparable device and worthy of consideration. Reply

Tablet is for reading, LCD in living room is for TV and movies. The iPad and HP Playbook at 4:3 are doing it right. 10" 16:10 is ok, just not after adding in soft keys and notification bar that cut down landscape height.Reply